SMAC MIO-16 TECHNICAL REFERENCE MANUAL. Revision 1.0, April 1998

Transcription

1 MIO-16 TECHNICAL REFERENCE MANUAL Revision 1.0, April 1998

2

3

4 S.M.A.C VAN ALLEN WAY CARLSBAD, CA PHONE: / FAX: FOR TECHNICAL ASSISTANCE CALL: COPYRIGHT AUTOMATION MODULES, INC. 1998

5 Table of Contents 1. INTRODUCTION SPECIFICATIONS DIGITAL I/O INTERFACE General Purpose Inputs General Purpose Outputs Digital I/O "States" I/O Technical Specifications SERIAL DATA INTERFACE Connection Requirements APPENDIX A, MIO16 CONNECTOR PIN DEFINITIONS INDEX

6 6

7 1. Introduction The MIO16 is an input / output (I/O) expansion module for use with the S100, S120, S200, S400 and SB100 family of servo controllers. It has 8 channels each of undedicated optoisolated input and output. With a power supply input range of VDC, the MIO16 can gets its power from the same source as the servo controller it is used with. Communication with the host servo controller is achieved with a proprietary synchronous serial interface using 6-pin modular connectors. A DIP switch is provided for addressing purposes in telling the MIO16 which group of 8 I/O channels it should occupy. Lastly, a dual LED display indicates the presence of power supply and when the MIO16 is communicating with the host controller. 1.1 Specifications Description General Purpose Digital I/O Communication Interface Supply Voltage Dimensions Weight I/O Expansion Module 8 Optoisolated Inputs, 8 Optoisolated Outputs Proprietary Synchronous Serial Channel +11 To +50 VDC Approximately 4.0 Long by 3.3 Wide by 1.1 Thick Approximately 1 Lb. Table 1. Specifications. 1.2 Digital I/O Interface The MIO16 includes 8 channels of general purpose digital input and 8 channels of general purpose digital output. All of these I/O are protected through the use of optoisolators General Purpose Inputs Figure 1 illustrates one of the MIO16 s general purpose inputs. These inputs are galvanically isolated from the MIO16. Current of the proper polarity must be supplied to the circuit to activate the input. 7

8 Figure 1. MIO16 General Purpose Inputs General Purpose Outputs Figure 2 illustrates one of the MIO16 s general purpose outputs. These outputs are galvanically isolated from the MIO16. When an output is activated, positive current will flow from the collector of the optocoupler transistor (the output pin) to its emitter (the output return pin). Figure 2. MIO16 General Purpose Output Digital I/O "States" With regard to the host servo controllers, there are several commands that deal with controlling the digital I/O. All of these commands operate based on the following philosophy: With regard to an input, "active" means there is sufficient current flowing through that input and "inactive" means there is lack of sufficient current through that input. With regard to outputs, "active" means the ability for an output to pass current and "inactive" means the inability for an output to pass current. The Channel High (CH) and Channel Low (CL) commands provide the user with the ability to determine whether a channel is active in the "on" state (CH) or active in the "off" state (CL). This is analogous to a switch and to whether it is normally open or normally closed. The Channel On (CN) and Channel Off (CF) commands do exactly as they imply in that they will turn a given output either on or off, which will make that output either active or inactive depending on the CH and CL commands as stated previously. The (CH) command causes the following interpretation of the inputs and outputs: An "activated" output is considered to be ON (e.g., Channel On CN command). An "inactivated" output is considered to be OFF (e.g., Channel Off CF command). An "activated" input is considered to be ON (e.g., Do If On DN command). An "inactivated" input is considered to be OFF (e.g., Do If Off DF command). The (CL) command causes the following interpretation of the inputs and outputs: An "activated" output is considered to be OFF (e.g., Channel Off CF command). An "inactivated" output is considered to be ON (e.g., Channel On CN command). An "activated" input is considered to be OFF (e.g., Do If Off DF command). An "inactivated" input is considered to be ON (e.g., Do If On DN command). Input Current CH CL Output Current CH CL Flowing On Off Flowing CN CF No Flow Off On No Flow CF CN 8

9 Table 2. I/O States I/O Technical Specifications General Purpose I/O Nominal Specifications Unit Specification 5 V Minimum voltage to activate input ma Input current at minimum activation voltage. 24 V Maximum input voltage ma Input current at maximum voltage. 1.1 V Maximum voltage to deactivate input. 6 V Absolute maximum reverse input voltage. 40 V Maximum voltage output can sustain. 100 ma Maximum current output can sustain. Table 3. General Purpose I/O Specifications. 1.3 Serial Data Interface Communication between the host servo controller and the MIO16 modules is achieved with an RS-422 synchronous serial interface using 6-pin modular connectors. A DIP switch is provided for addressing purposes in telling the MIO16 which group of 8 I/O channels it should occupy. Figure 3 shows the valid module addresses and what I/O channels that particular address occupies. This allows for a total of up to 64 I/O points. In most cases, channels 0-7 are reserved for the host controller so a module using the setting with all DIP switches down would not function. Figure 3. DIP Switch Settings. 9

10 1.3.1 Connection Requirements The communications cable needed to connect the modules is a simple pin 1 to pin 1, six conductor modular cable with modular connectors at each end. This is sometimes referred to as a reversed cable assembly. The distance between modules and the length of the cable should be kept as short as possible. The same type of cable assembly can be used to connect the host to the first module as well as for daisy chaining from the first module to additional modules. The connection to the modules need not be in any particular order. Each MIO16 module is capable of operating from the same DC power supply as its host controller. This can be convenient, but it is important to note that each MIO16 module should have a direct ground path to the host controller. See Figure 4. Figure 4. Typical Connection Scheme. It is important to note a couple of items that will ensure proper operation of the MIO16 modules with their host controller: While it is okay for the host controller to be powered while MIO16 modules are not powered, when MIO16 modules are powered-up, the host should not try to communicate with them (i.e. I/O commands). MIO16 modules should all be powered-up at the same time. 10

11 2. Appendix A, MIO16 Connector Pin Definitions J1- User I/O Interface : 26-Pin H/D Female D-Sub Mating Connector: NorComp# HDT26P Digi-Key# T826M 1. Output 3 return 2. Output 2 return 3. Output 1 return 4. Output 0 return 5. nc 6. Input 3 7. Input 2 8. Input 1 9. Input Output Output Output Output nc 15. Input 3 return 16. Input 2 return 17. Input 1 return 18. Input 0 return 19. Common VDC 21. Common VDC 23. Common VDC 25. Common VDC J2, J3 - I/O Expansion Interface : 6-Pin Modular Jack Mating Connector: AMP# Digi-Key# A Transmit Data- output 2. Receive Data- input 3. Transmit Data+ output 4. Receive Data+ input 5. Clock+ input 6. Clock- input J4 - User I/O Interface : 26-Pin H/D Female D-Sub Mating Connector: NorComp# HDT26P Digi-Key# T826M 1. Output 7 return 2. Output 6 return 3. Output 5 return 4. Output 4 return 5. nc 6. Input 7 7. Input 6 8. Input 5 9. Input Output Output Output Output nc 15. Input 7 return 16. Input 6 return 17. Input 5 return 18. Input 4 return 19. Common VDC 21. Common VDC 23. Common VDC 25. Common VDC J5 - Power Interface : 4-Pin 5.08mm Centers Phoenix Mating Connector: OnShore# EDZ95002 Digi-Key# ED Main power return 2. Main V+ power input 11

12 3. Index A Appendix A Connector Pin Definitions 11 C Connection requirements 9 D Digital I/O "states" 8 Digital I/O interface 7 G General purpose inputs 7 General purpose outputs 8 I I/O technical specifications 9 Introduction 7 S Serial data interface 9 Specifications 7 T Table of Contents 5 12